Drawing mechanism



A.,C. BUTLER.

DRAWING MECHANISM.

APPLICATION FILED FEB. Ia, I92I.

1,428,271, Patenasept; 5,1922.

IIIIIIIIIH III IEII- IIIIIIIIII II IllIIII Patented Sept. 5,l 1922. p i

UNlTED STATES ARTHUR CECIL BUTLER, OF BOSTON, `MASSACHUSETTS DRAWINGMECHANISM.

Application led February 18, 1921. Serial No. 445,921.

`To all 'wlw/nt it may concern.'

Be it known that I, ARTHUR CEOIL BUTLER,

a subject ofthe King of Great Britain, residing at Boston, in the countyof Suffolk andv State of Massachusetts, have invented new and usefulImprovements in Drawing Mechanism, of which the following is aspecicatio This invention v relates to apparatus for the drawing ofwool, cotton or other fibrous material. While my object is to providemechanism for drawing out'long fibers of wool such as used in themanufacture of worsted yarns, neverthelessit may be effectively used inthe drawing of roving composed of lrelatively short fibers such as isthe manufacture of moreno yarns wherein a mixture of wool and cotton areused, or in the drawing of rovings formed of relatively short cottonstaple.-

The object of the invention is to provide for a greater draft orattenuation of the roving at one operation than can at present beobtained without the production of un- I both in the-English orBradford, and the even roving; that is, yarn which varies ntermittentlyin its bulk or diameter. In' fact, the invention (as will be explained)is applicable for drawing yarns or rovings French systems. Ordinarily,in the Braolford system of drawing, as well as in the Bradford spinningframe, three, four or more lines or sets of drawing rollers are port theroving while it is being drawn outbetween the front and back lines orpairs of rolls. The top intermediate rolls are light,

and usually self-weighted, and the fibers,

when seized by the front pair of rolls, are drawn from beneath them.'

According to my invention, I may substitute for all or some of theintermediate top rolls a gravity cap which rests upon the rollstherebeneath, and permits the fibers to be drawn out evenly and theroving or yarn to become attenuated without the formation of thin orweak spots. This cap rests loosely on at least two rolls, although itmay be so arranged as to engage the roving over only one of the rolls onwhich it rests. The cap ,is relatively light, beingof sufficient weight,however, to cause thevroving or the sliver, as the case'may be, to befrictionally engaged by the rolls upon which it rests. What may betermed the rear endof the cap is so curved or hooked as to be maintainedin position by the roll on which the said rear end rests, and its frontend is curved more or less to approximate the curvature of the roll uponwhich it in turn rests. Each cap may be'of sufficient width for theengagement of a single roving or sliver, or it maybe wide enoughtoengage several, all

as may be desired. Preferably the capI is provided intermediate of itsends with a guide for the roving passing'beneath it, and this guide maybe so formed as to act as a. condenser for concentrating the roving orsliver being attenuated or drawn. Since the rear end of the cap is soformed as to take over and rest upon the bottom roll, it is preferablyprovided with a slot or opening through which the roving or sliverpasses to engagement with the bottom roll upon which the rear end of thecap rests. A.The cap, being supported by rotating rolls, may be easilymoved laterally by the lateral movement of the sliver or roving underthe Aimpulse of the usual traverse bar in the rear of the lines or pairsof rolls, the cap being sulliciently light toy permit its lateralmovement without danger of breaking the sliver or rovmg. p

On the accompanying drawings,-

Figure 1 represents in end elevation, a

roll stand embodyingtlie invention.

upside-down to show the condensing guides which are located intermediateits ends.

Figure 7 illustrates another form of cap in which the forward end isprovided with a spring member.

Referring first to Figures 1 and 2, the roll stand 10 is provided withthe front top and bottom rolls 11 and 12, and the rear rolls 13 and 14.l have illustrated two intermediate bottom rolls 15, 16, with which maybe employed a cap such as I have described. At 17 there is indicated atraverse bar. through which the sliver or roving a' is passed previousto its being gripped between the rear rolls 13, 14. rllhe intermediateroll 15 is shown as being somewhat larger in diameter than theintermediate roll 16, this not being essential although at timesdesirable, as will be well understood by those skilled in the art. rlhatis to say, where a relatively long staple is employed in the formationof the sliver or roving, I employ a relatively large roll 15; whereas,when the sliver is formed of relatively short staple, such as cotton orcotton waste, l may use a relatively small roll as at 15. The cap isindicated at 18. llt consists of al plate, preferably of metal or othermaterial of relatively high gravity; and, at what I may term its rearend, it is curved as at 19 so as to hook more or less loosely around theroll 16. lts front end 20 is curved to conform to the periphery of theroll 15 upon which it rests by gravity, and towards and from which itmay move by a pivotal action about the axis of the roll 16. Preferablythe lines of rolls on the roll stand are set at an angle to thehorizontal as shown, so that the cap 18 will hang forwardly anddownwardly. At its rear curved end 19, the cap is provided with aconverging slot 21, through which the roving or sliver a may pass fromthe rolls 13 and 14 into engagement with the roll 16,-and likewise atits front end the cap may be provided with a converging slot 22 throughwhich the roving or sliver may emerge from the roll 15 on its way to thefront drawing rolls 11 and 12. Between its' ends and on its under sidethe cap is preferably provided with a guide for the roving, whichPreferably takes such form as will serve to condense and frictionallyengage the roving or sliver passing through it. rlhis guide comprisestwo forwardly-converging lugs 23, 23, the confronting faces of which maybe arcuate or conveXly curved as illust-rated in Figure 6." As thetraverse bar 17 is reciprocated lono'itudinally of the axes of the rollsfor t e purpose of causing lateral traverse of the roving or sliver, theengagiemlent of the roving with the front, rear and intermediate guides21, 22, 23 of the cap cause the cap to move laterally with it.

1t will be observed that, by the construction which ll have thusdescribed, the roving or sliver is positively gripped only by the frontand rear pairs of rolls bet-Ween which the actual drawing or attenuationof the roving or sliver takes place. ln this case, the roving issupported between these rolls by the intermediate rolls 15 and 16, withwhich it is lightly maintained in contact by the cap, thereby ensuringthe even and uniform attenuation of the roving.

lin Fignre3, l have illustrated another embodiment of the invention inwhich, between the front and rear rolls 11, 12, 13, 14, l have providedfour lower rolls 24, 25, 26 and 27. For the two rolls 26 `and 27, lemploy a cap 28 substantially -similar to that at 18. l have illustrateda top roll 29 as being associated with the intermediate roll 25, and acap 30 engaged with the roll 25 and having it-s front end associatedwith the larger intermediate roll 24. ln this case, the recess or slotat the rear end of the cap 30 is wide enough to receive therein the roll29 and to permit the necessary traverse motion of the cap in referenceto the roll 29.

rolls 11, 12, 13 and 14, ll have provided three intermediate rolls 31,32 and 33, with all three of which there is engaged a single cap 34. lnthis case the rear curved end of the cap engages t-he roll 31 and thefront curved end engages the roll 33. rThe intermediate portion of thecap is tangential to the roll 32, or, if desired, it may be slightlyconcave so as to conform to the convex curvature of the roll 32 withoutdeparting from the spirit of the invention. By making this intermediateportion of the cap concave, ll increase the frictional engagement of theroving with the roll 32. llhe cap 34 may be provided with two guides 35,36, on its under side, similar to those formed by the lugs 23, 2a.

1f desired, the front end of the cap may be provided with a springmember 37, as illustrated in Figure 7 rlhis spring member may be formedof a leaf spring of thin metal which will yield under light pressure.The forward curved end of the main body of the cap, which overhangs thisspring, limits the extent to which it may move and also serves toprotect it against injury.

1 have not illustrated the mechanism by which all of the various bottomrolls are rotated at the proper speeds, nor the mechanism forreciprocating the traverse bar, as such mechanism is well known, and,per se, forms no part of the present invention.

@ne of the functions performed by what for convenience l have termed theroving guide, formed by the lugs 23, is that of frictionally engaging'the roving and retardin the loose ibers which are not yet gripped by thefront pair of rolls, so that they are not too freely pulled along bythose 90 ln Figure 4, between the front and rear f fibers which aregripped by said rolls. Instead of the particular form of guide which Ihave shown, any other form which will serve the purpose may be employed.

Vhat I claim is l. A drawing mechanism comprising bottom rolls, and agravity cap hung upon one of said rolls and resting loosely upon theother roll and under which the roving passes.

2. A drawing mechanism comprising front and rear pairs of top and bottomrolls, a plurality of intermediate bottom rolls, and a gravity capresting loosely upon said intermediate rolls and under which the rovingpasses.

3. A drawing mechanism comprising bottom rolls, and a gravity cap hungupon one of said rolls and resting loosely upon the other roll and underwhich the roving passes, said cap having a roving guide on its underface intermediate said rolls.

4. A drawing mechanism comprising spaced bottom rolls, and a gravity capresting on and supported entirely by said rolls to press the rovingthereagainst, said cap having one end curved to embrace one of saidrolls and having its free end resting loosel on the other roll.

5. A drawing mechanism comprising spaced bottom rolls, and a gra\ itycap resting on and supported entirely by said rolls to press the rovingthereagainst, said cap having one end curved to embrace one of saidrolls and having its free end resting loosely on the other roll, saidcap having a roving guide onits under face intermediate its ends.

to press thevroving thereagainst, said cap having one end curved toembrace one of said rolls and having its free end resting loosely on theother roll,- said cap having a guide in said curved end to receive theroving.

8. A drawing mechanism comprising spaced bottom rolls, and a gravity capresting on and supportedentirely by said rolls to press the rovingthereagainst, said cap having one end curved to embrace one of saidrolls and having its free end resting loosely on the other roll, saidcap having guides at each end for the roving.

9.IA drawing mechanism comprising a traverse bar, spaced bottom rolls,and a cap resting upon and supported entirely by said rolls, and at oneend embracing one of said rolls, said cap having a roving guide forcausing the roving to pass between said cap and said rolls, the partsbeing so related that the lateral movement of the roving by the traversebar causes the said cap to move laterally therewith.

In testimony whereof I have affixed my signature.

l ARTHUR CEGIL BUTLER.

